By using a series of acoustic sensors to detect the “distinct acoustic signature” of a gunshot, the Helicopter Alert and Threat Termination system is able to pinpoint the position of the shooter. In the field, this would keep troops better protected against small arms fire.
-via Gizmodo.com

A simple tweak to detect the ‘distinct acoustic signature’ of fish sipping in the film or crashing through the water’s surface, the sure-to-soon-to-be developed Fish Alert and Rapid Tracking (FART) system’s acoustic sensors could allow any fisherman, regardless of hearing or sight impairment, to pinpoint the position of their quarry.